package DiErZhou.Secondweek;

import java.util.Locale;

public class StudentXitong {
    public static void main(String[] args) {
        StringBuffer s=new StringBuffer("java");
        s.append("是一门重要的编程语言");
        String s1= s.toString();
        System.out.println(s1.length());

        System.out.println(s1.toUpperCase());

    }
}
